Bug 2460700 (CVE-2026-31475)

Summary: CVE-2026-31475 kernel: ASoC: sma1307: fix double free of devm_kzalloc() memory
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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OS: Linux   
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A flaw was found in the Linux kernel's ASoC sma1307 component. An incorrect cleanup operation attempts to manually free memory that is already managed by the device resource management (devres) system. This can lead to a double free vulnerability, potentially causing memory corruption and system instability, which could result in a denial of service.
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Description OSIDB Bzimport 2026-04-22 15:06:15 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ASoC: sma1307: fix double free of devm_kzalloc() memory

A previous change added NULL checks and cleanup for allocation
failures in sma1307_setting_loaded().

However, the cleanup for mode_set entries is wrong. Those entries are
allocated with devm_kzalloc(), so they are device-managed resources and
must not be freed with kfree(). Manually freeing them in the error path
can lead to a double free when devres later releases the same memory.

Drop the manual kfree() loop and let devres handle the cleanup.
Comment 1 Keith Grant 2026-04-22 18:23:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026042256-CVE-2026-31475-74ed@gregkh/T